Armature-core for dynamos



VD. HIGHAM. ARMATURE GORE kPOR. DYNAMOS.

Patented Aug. 20, 1889'.

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` UNITED STATES PATENT OFFICE.

DANIEL HIGIIAM, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE I-IIGHAM PATENT RIGHT COMPANY, OF ROOKLAND, MAINE.

ARMATU RE-CORE FOR DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 409,463, dated August 20, 1889.

Application filed May 10,' 1889. Serial No. 310258. (No model.)

To all whom, t may concern:

Beit known that I, DANIEL HIGHAM, a citizen of the United States, and a residentrof Philadelphia, Pennsylvania, have invented Improvements in Armature-Cores for Electric Generators, of which the following'is a speciiication.

My invention relates to the construction of the cores of drum-wound armatures for dynamo-electric machines and electric motors; and lny invention consists more particularly of an improved form of disk, of a number of which the core is to be built up. In drum-wound armatures as now generally construct-ed the cores are either built up of a large number of thin disks of iron separated by sheets of insulating; material, or, on the other hand, they are built up of thick iron disks sim- `ply separated from contact with each other by intervening air-spaces. This latter construction permits the sheets of insulating material to be `dispensed with; but itis, nevertheless, more costly to manufacture than a core built up of thin iron disks with insulating-sheets. The chief reason for this is that thick disks (which necessarily have to be made quite true and straight, so that they shall not come in contact with each other when the core is built up) will cost more than a greater number of thin disks, which can be held straight against the insulating' material by being clamped between the usual end plates on the shaft. A core built up of thick disks also has the objection that it is more favorable to the generation of eddy or Fou- Gault currents, which reduce the efliciency of the machine.

It is the object of my present invention to so form the disks of which the armature-core is to be built up that they may be made of very thin iron, and yet bestrung on the shaft without sheets of insulating material between them. To accomplish this object I take disks of comparatively thin sheet-iron and suitably flute or corrugate them, so that they become practically rigid or stiff, or as rigid or stiff as the thick iron disks which have been heretofore used.

In the accompanying drawings, Figure l is a vertical sectional view of a number of disks corrugated in accordance with my invention and strung` upon the shaft; but I have not thought it necessary to illustrate a complete armature-core; and Fig. 2 is an end view of the armature, with the shaft in section.

In the drawings, A may be said to represent theaxis or shaft of the armature, and B the spaced corrugated disks which are to be strung thereon, and which may be secured in 'any suitable manner. In the presentinstance I have illustrated a washer a and a nut b, which latter is screwed onto the shaft at the one end of the set of disks, and corresponding nuts and washers maybe applied at the other end to clamp the disks between them.

I prefer to form the disks B with annular corrugations, as illustrated in the drawings, although I do not restrict myself either to the direction in which the corrugations shall run or to their form. The electrical` conductors may be wound or otherwise placed upon this core in any well-known way.

As a simple and convenient way of providing for the spacing of the main parts of the disks from each other to leave the necessary air-spaces, the corrugation at the center of each disk around the opening through which the armature-shaft has to pass may be made at such an acute angle, as shown in Fig. l, that when the disks are placed together they will come into contact with each other only at this inner corrugation with its acute inclination, the remaining portion of each disk being separated from its neighbors by air-spaces. I do not wish, however, to confine myself to this means for spacing the corrugated disks, as this may be also provided for in other ways.

I claim as my invention- 1. An armature-core for drum-windin g, consistin g of a shaft and a series of thin iron corru gated disks mounted thereon, with intervening air-spaces, but without other insulation than the air-spaces, substantially as described.

2. An armature-core for drum-winding, consisting of ashaft and a series of thin iron corrugated disks mounted thereon, with intermediate air-spaces, except near the shaft, where the disks are in Contact with each other, substantially as set forth.

A core for the armature of a dynamo- IOO electric machine or electric motor having;` its spaced from each other when strung upon the 1o main body composed of spaced iron disks proshaft, all substantially as set forth.

vided with annular corrugations, substzin- In testimony whereof I have Signed my tially as and for the purpose set forth. name to this specification in the presence of 5 l. A core for the armature of u dynumotwo subscribing' witneSscS.

electric machine or electric motor, comprising DANIEL HIGHAM.

:i shaft and corrugated thin iron disks mounted Wi tncsses:

thereon und acute corrugntions at the center7 HUBERT HOWSON,

whereby the main portions of the disks are HARRY Sm'rl'r. 

